Squirting 'em with water is good on veg, broad beans for example, but you don't want to be wrecking all your flowers in a hanging basket for a fortnight. You could have a look in your basket and nip out affected shoots. If there are too many of them, use pyrethrum (not permethrin) last thing at night. The pyrethrum will be spent by morning and you'll spare most of the bees and other beneficial insects which will be safely tucked up in bed by late evening. In future, garden for wildlife: plenty of diversity and not too much tidiness. And take note of which plants always cop it. Pansies always get attacked in my garden so I grow 'em less and less these days. My big issue is vine weevil grubs. I never saw any until six or seven years ago but now I'm plagued with 'em every year in every container by September.